Section Date Physical Geology Activity Rock Cyele Worksheet Distinctive Property

Question

Section Date Physical Geology Activity Rock Cyele Worksheet Distinctive Property Original Material Geologic Process New Material cooling and crystallization pink color and coarse crystals 1. magma 2 sand Aggregate of visible sand grains cemented together 3 granite gneiss no pore space between fused grains quartzite slate foliation liquid 6. gneiss clay Layered rock 7. granine 8. imestone 9 magma 10. shale weathering. ec. 12. lava black with small crystals fizz in acid Glassy with conchoidal fracture 13. shell 14. cooling without I5. quartzite gravel 16. plant remains layered black rock cooling and crystallization 17 50% black and 50% while coarse crystals lithificatiorn

Explanation / Answer

5. Original Material: Shale

Geologic Process: Metamorphism

Shale consist of fine grains of sedimentary rocks formed from mud, calcite clay and quartz. The shale undergoes low grade metamorphism and forms fine layers or foliations of clastic material, giving rise to slate. The foliation in slate is easily seen and consists of thin layers that are parallel to each other.

6. Geologic Process: heating and melting

New Material: Silica rich magma

Gneiss can be melted by rising temperature due to subduction at great depths. The temperature causes the Gneiss to melt and to form silica-rich magma which will be over time extruded onto the surface of the earth. This cycle of rock formation of melting under high temperature to form magma and the magma being in turn extruded onto the earth’s crust- completes the rocky cycle.

7. Geologic Process: Weathering

Granite undergoes weathering and crumbles down to form a highly friable rock which can be easily eroded. Though the resistant minerals like feldspar and quartz remain unaffected, the fragments of clay absorb water and forms clay that mixes into the soil profile.

8. New Material: Marble

Distinctive Property: Light coloured, highly compact crystal that can be polished to offer high shine. The hardness is 4 and even though it is not as strong as granite, the rock is more aesthetic.

Metamorphism of limestone causes re-crystallisation of the calcite crystals- bringing the crystals closer together and interlocking to form a beautiful, light coloured rock that is hard enough to be carved and polished.

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